7. Follow-up Infant Visit: The Study Coordinator will follow up by phone several times from birth to 18 months in order to verify subject's contact information. The infant (accompanied by mother) follow-up visit will take place at MUSC's CTRC Outpatient Clinic around 18 months postpartum. The infant will have blood drawn for vitamin D and will have a dental assessment of the primary teeth, including digital photographic images.